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onion thrips field tour
Onion Treasure Valley - Idaho
announcement
Posted on: August 6, 2012 by Jerry Neufeld
Attached is a flyer about an upcoming field tour on thrips control in onions. Tour is Wednesday, August 8, from 3:30 to 5 pm at the UI Parma R and E Center. Refreshments will be served. Click on the pdf below for more details.
Potato Psyllids and Zebra Chip
Potato All Locations
Potato Psyllids and Zebra Chip
Posted on: August 3, 2012 by Erik Wenninger
U-Idaho ZC and potato psyllid update – 3 Aug 2012
Potato psyllids continue to be found across several sites being monitored by the University of Idaho. Numbers are up considerably at two sites. Sixteen potato psyllids were trapped on yellow sticky cards this week at the Kimberly R&E Center (and two psyllids were collected by vacuum sampling), and 54 potato psyllids were trapped on a grower’s field in Twin Falls County. Eight psyllids were trapped on sticky cards in a field in Jerome County, and one was trapped in another field in Twin Falls County. We have yet to find immature potato psyllids on leaf samples taken from potato fields. See the U-Idaho site below to view a table that details where (by county) and when potato psyllids have been found so far during this season in Idaho.
Thus far, zebra chip in potato plants has been confirmed by PCR (molecular testing) at three locations in Twin Falls County (including the Kimberly R&E Center) and one location in Minidoka County. Plants with ZC symptoms have been collected or reported from other locations, but we are awaiting confirmation with PCR results.
We continue to encourage vigorous scouting efforts. Refer to the sites below for guidance on scouting and IPM programs (including insecticide recommendations) for potato psyllids.
» http://www.kimberly.uidaho.edu/potatoes/
» http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf
powdery mildew in sugarbeets
Sugarbeets Magic Valley
powdery mildew
Posted on: August 3, 2012 by Jerry Neufeld
Powdery mildew has been positively identified by Amalgamated Sugar Company Crop Consultants in sugarbeet fields in the Magic Valley of Idaho near Filer. Based on the early disease onset a protective fungicide application is suggested as well as continued scouting to assess disease development. There are several fungicides available for use to treat powdery mildew, including sulfur dusts. Click on the pdf below for recommendations from the 2012 PNW Plant Disease handbook. Depending on the disease pressure, applications with different chemistries should be repeated every 7 to 14 days. Contact your crop consultant from the Amalgamated Sugar Company if you have questions about treatment options.
Potato Psyllids and Zebra Chip
Potato All Locations
Potato Psyllids and Zebra Chip
Posted on: July 31, 2012 by Erik Wenninger
University of Idaho potato psyllid scouting update – 31 July 2012
Potato psyllid captures were down slightly for the week of 23 July. We are reporting the first detection of potato psyllids in Gooding and Bonneville Counties, and the first report of liberibacter-positive psyllids in Canyon and Minidoka Counties this year.
From the University of Idaho sampling network, we collected the following from sticky cards last week: 1 psyllid from one site in Gooding County; 2 psyllids from one site in Minidoka County; 3 psyllids from one site in Bonneville County; 8 psyllids from one site in Jerome County; 9 psyllids from one site in Twin Falls County; and 2 psyllids from the Kimberly R&E center (in Twin Falls County).
Crop consultants and growers submitted the following on yellow sticky cards: 6 psyllids from 3 different sites in Elmore County; 3 psyllids from 2 sites in Canyon County; and 1 psyllid from a non-commercial site in Payette County.
From sticky card samples that were collected during the week of 16 July, 3 of 7 psyllids tested positive for liberibacter from one Twin Falls County site; 3 of 4 psyllids tested positive from another Twin Falls County site; 3 of 8 psyllids tested positive from the Kimberly R&E Center, and 2 of 6 psyllids tested positive from one Jerome County site. The one psyllid collected from a vacuum sample at a Twin Falls County site tested positive. In addition, psyllids on sticky cards (bulk sampled by location) submitted by crop consultants from fields in Minidoka, Elmore, and Canyon Counties tested positive for liberibacter.
The following is a brief summary of potato psyllid findings on sticky cards to date in Idaho:
University of Idaho sampling network:
Twin Falls County (3 sites, including Kimberly R&E Center) – adult psyllids (some positive for liberibacter); zebra chip infected plants confirmed (2 sites, including Kimberly R&E Center)
Jerome County (2 sites) – adult psyllids (some positive for liberibacter at one site only)
Minidoka County – adult psyllids (some positive for liberibacter)
Bonneville County – adult psyllids (awaiting results from liberibacter test)
Gooding County – adult psyllids (awaiting results from liberibacter test)
Other counties where scouting is occurring but no psyllids have been found: Madison, Bingham (2 sites) and Canyon (4 sites)
Samples submitted by crop consultants or growers:
Elmore County – adult psyllids (some positive for liberibacter)
Canyon County – adult psyllids (some positive for liberibacter)
Minidoka County – adult psyllids (positive for liberibacter)
No colonization of psyllids has been detected in scouted fields; i.e., we have yet to find any nymphs in fields. All psyllids have been adults trapped on yellow sticky cards, with the exception of 2 sites in Twin Falls County that were collected with a vacuum sampler. First detection of liberibacter-infected potato psyllids was June 19 in Twin Falls County. Plants and tubers with zebra chip symptoms (confirmed by molecular tests) were first detected July 17 in Twin Falls County. Additional samples have been submitted since that date and are awaiting confirmation.
We encourage everyone to increase scouting efforts. Ensure adequate insecticide treatment of the perimeter of fields, which may be missed by aerial application; psyllids are known to colonize fields first along the perimeter. Both potato psyllids and liberibacter are known to not be favored by very hot weather, but the role that weather has played in our findings to date or in disease epidemiology in general remains unclear.
Refer to the sites below for guidance on scouting and IPM programs for potato psyllids.
» http://www.kimberly.uidaho.edu/potatoes/
» http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf
Test Alert
All Crops Treasure Valley - Oregon
Posted on: July 30, 2012 by Matt Goodale
This is a test alert, please ignore this message.
Potato Psyllids and Zebra Chip
Potato All Locations
Potato Psyllids and Zebra Chip
Posted on: July 22, 2012 by Erik Wenninger
The single potato plant observed on July 17 at the Kimberly R&E Center with zebra chip symptoms has tested positive for liberibacter, the bacterium that causes zebra chip. Several other plants with suspicious wilting symptoms were tested as well, and two of them also tested positive for liberibacter. Since these samples were taken, at least two additional plants were found at the Kimberly R&E Center with zebra chip symptoms; these also will be tested for liberibacter.
Also on July 17, several plants with suspicious symptoms from a grower field from which liberibacter-positive psyllids had been collected were tested for liberibacter. These plants all tested positive for liberibacter.
Two of the four psyllids collected from last week’s U-Idaho scouting program (week of July 9) tested positive for liberibacter. Both positive psyllids were in Twin Falls County; the psyllid found in Jerome County was negative.
The number of potato psyllids collected by our scouting program is now increasing, though numbers are still much smaller than what has been found in the Columbia basin. This past week, the U-Idaho sampling program collected potato psyllids from three grower fields (all in Twin Falls County) and from the Kimberly R&E Center. From the three grower fields, we collected 8, 6, and 4 potato psyllids, all but one of which was collected on yellow sticky cards (one was from a vacuum sample). We collected 8 psyllids at the Kimberly R&E Center.
Additionally, last week several potato psyllids were found on sticky cards taken into the Kimberly or Parma R&E Centers by crop consultants. Three potato psyllids were found across two potato fields in Canyon County, and on July 15 a single potato psyllid was collected from the Sand Hollow area of Canyon County from potatoes in a non-commercial setting. All samples will be sent to the University of Idaho campus to test for liberibacter.
We have now confirmed what is to our knowledge the first finding of ZC potato plants from this year’s planting in the Pacific Northwest this season. However, we continue to encourage scouting in order to make the most sound and appropriate management decisions for a given field.
Refer to the sites below for guidance on scouting and IPM programs for potato psyllids.
http://www.kimberly.uidaho.edu/potatoes/
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf
powdery mildew in sugarbeets
Sugarbeets Treasure Valley - Idaho
powdery mildew
Posted on: July 20, 2012 by Jerry Neufeld
Powdery mildew has been positively identified by Amalgamated Sugar Company Crop Consultants in sugarbeet fields in the western Treasure Valley of Idaho and Oregon. There are several fungicides available for use to treat powdery mildew, including sulfur dusts. Click on the pdf below for recommendations from the 2012 PNW Plant Disease handbook. Depending on the disease pressure, applications with different chemistries should be repeated every 7 to 14 days. Contact your crop consultant from the Amalgamated Sugar Company if you have questions about treatment options.
thrips control field tour
Onion Treasure Valley - Idaho
onion thrips
Posted on: July 20, 2012 by Jerry Neufeld
Attached is a flyer about an upcoming field tour on thrips control in onions. Tour is Wednesday, August 8, from 3:30 to 5 pm at the UI Parma R and E Center. Refreshments will be served. Click on the pdf below for more details.
corn earworm
Corn Treasure Valley - Idaho
corn earworm
Posted on: July 20, 2012 by Jerry Neufeld
The University of Idaho CIS 366 entitled “Timing Corn Earworm Control,”states that summer corn earworm moths will begin laying eggs in fresh corn silk at approximately 1300 growing degree days (GDD). Egg hatch and larvae attack will begin about 73 GDD later. Click on the pdf below to view CIS 366.
According to the Oregon State University GDD model for Corn Earworm (http://uspest.org/cgi-bin/ddmodel.pl?clm), we are currently at 1164 GDD in the Caldwell area, 1134 GDD in the Nampa area, and 1130 GDD in the Parma area. We will hit 1300 GDD in the Caldwell area on approximately 7/23, 1300 GDD in the Nampa area on approximately 7/26, and 1300 GDD in the Parma area on approximately 7/26. At each location, we will hit 1373 GDD about 3 to 4 days after reaching 1300 GDD. Those fields with fresh silk at 1373 GDD are most vulnerable to attack from corn earworm larvae.
Elm Seed Bug
Announcements Treasure Valley - Idaho
Elm Seed Bug
Posted on: July 19, 2012 by Jerry Neufeld
Attached is a press release from the Idaho State Department of Agriculture about “Elm Seed Bug”, a new invasive insect found for the first time in the U.S. Click on the pdf below for more information.
Organic Field Day at U-Idaho, Kimberly
All Crops All Locations
Posted on: July 18, 2012 by Erik Wenninger
The University of Idaho and NCAP will be holding an Organic Research Field Day at the Kimberly R&E Center on July 24. See the link below for details and registration information.
This field day will feature a variety of University of Idaho research projects:
• Cover Crop Calculator – Amber Moore
• Cover Crop and Forage Variety Trials – Christi Falen, Lauren Hunter, Glenn Shewmaker, and Steve Hines
• Biocontrol for White Mold in Dry Beans – Oliver Neher
• Meals as Potential Organic Pesticides in Dry Beans – Don Morishita, Oliver Neher, and Erik Wenninger
• Organic Seed Production of Beans, Winter Wheat, and Spring Barley – Kathy Stewart-Williams
• Colorado Potato Beetle Response to Potato Varieties – Erik Wenninger
• Potato Virus Y Management in Potatoes – Oliver Neher
• Organic Potato Fertility Guide – Amber Moore
• New Potato Varieties, Cultural Management Trials, and Implications in Storage – Nora Olsen
• Composting of offal, mortalities, and grape vine prunings – Mario de Haro Marti
» http://pesticide.givezooks.com/events/ui-organic-field-day
Plant with zebra chip symptoms found in Idaho
Potato All Locations
potato psyllid & zebra chip
Posted on: July 17, 2012 by Erik Wenninger
A single potato plant was observed on July 17 at the Kimberly R&E Center with classic zebra chip symptoms: aerial tubers, pink coloration on leaves, curling of leaves, and characteristic internal discoloration of tubers. Samples were sent to the University of Idaho campus to run molecular tests to confirm presence of liberibacter, the causal agent of zebra chip, but based on symptoms, we are reasonably confident that the plant is positive for zebra chip. The plant was pulled from the field and destroyed.
Additionally, psyllid samples collected on July 3 from two commercial fields in Twin Falls County have tested positive for liberibacter.
Samples for this week from other fields being scouted by the University of Idaho scouting program are still being collected and processed; we will have an update later on findings from these samples.
Two adult potato psyllids collected on yellow sticky traps from Elmore County on July 15 were taken into the Parma R&E Center. Two adult potato psyllids (one on July 13 and one on July 15) on yellow sticky traps from Minidoka County were taken into the Kimberly R&E Center. These samples will be sent to the University of Idaho campus to test for liberibacter.
To our knowledge, we have the first (preliminary) finding of a ZC potato plant from this year’s planting in the Pacific Northwest this season. However, we continue to encourage scouting in order to make the most sound and appropriate management decisions for a given field.
Refer to the sites below for guidance on scouting and IPM programs for potato psyllids.
» http://www.kimberly.uidaho.edu/potatoes/
» http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf
Blister Beetle Outbreak
All Crops Treasure Valley - Idaho
Native Punctate Blister
Posted on: July 17, 2012 by Tony McCammon
Blister Beetle Outbreak in Foothills Area of Ada County
July 17, 2012
Homeowners have reported large numbers of blister beetles in the foothills area of Ada County near Boise; specimens were identified by ISDA as the native punctate blister beetle (Epicauta puncticollis). Larvae of blister beetles serve as predators of grasshopper eggs, but adults feed on vegetation, occasionally moving to flowering field crops such as alfalfa. Bodies of adult beetles contain the chemical cantharidin, a toxic chemical that protects them from predators. Accidentally crushing a beetle against the skin can result in a painful blister, the source of the insect’s common name. Blister beetles have long (3/4 to 1-1/4 inch) narrow bodies, broad heads, and antennae that are about 1/3 the length of their entire bodies. The front wings are soft and flexible in contrast to the hard front wings of most beetles. The punctate blister beetles is black, however other blister beetle species that are tan to gray also occur. See picture attached.
Blister beetles seldom cause serious crop injury. However, in sufficient quantities, the cantharidin in the bodies of living or dead blister beetles can be toxic, and in some cases lethal, to horses, sheep, and cattle. Animals may be poisoned by eating crushed beetles in cured hay. Alfalfa growers should contact their local Extension office for information on management of these insects. Contact a veterinarian immediately if you suspect blister beetle poisoning in livestock.
Idaho potato psyllid update
Potato Magic Valley
potato psyllid
Posted on: July 13, 2012 by Erik Wenninger
A total of four adult potato psyllids was collected this week within U-Idaho’s potato psyllid sampling network throughout southern Idaho. One psyllid was collected on a yellow sticky trap from each of two grower fields in Twin Falls County. In addition, at the Kimberly Research & Extension Center, one psyllid was collected from a sticky trap and one was collected from a vacuum sample. These samples were sent to Moscow today to be tested for liberibacter. Obviously, numbers of psyllids continue to be rather low, and we still have yet to find potato psyllids of any life stage on potato plants themselves.
We continue to encourage scouting in order to make the most sound and appropriate management decisions for a given field.
Refer to the sites below for guidance on scouting and IPM programs for potato psyllids.
» http://www.kimberly.uidaho.edu/potatoes/
» http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf
green peach aphid
Potato Treasure Valley - Oregon
green peach aphid
Posted on: July 10, 2012 by Jerry Neufeld
Dr. Clint Shock, Superintendent at the OSU Malheur Experiment Station is reporting that green peach aphid populations are spiking in Malheur County potato fields.
Zebra chip pathogen confirmed in Idaho, and more Lso-positiv
Potato Magic Valley
potato psyllid & zebra chip
Posted on: July 9, 2012 by Erik Wenninger
Updated 8 July 2012
The potato psyllid sample from June 19 in Twin Falls County that tested positive for liberibacter, the zebra chip pathogen, was confirmed to be positive by gene sequencing. Samples from the following week (one from the Kimberly R&E Center and one from the same grower’s field in Twin Falls County) also have tested positive for liberibacter by PCR.
A few more adult potato psyllids (collected on July 3) have been found on yellow sticky traps in two different commercial potato fields in Twin Falls County, Idaho. These samples should be tested for liberibacter this week. Numbers of psyllids continue to be rather low (1 and 3 psyllids per field), and we have yet to find potato psyllids of any life stage on potato plants themselves, suggesting that colonization of fields has not yet occurred.
Field bindweed found harboring potato psyllid eggs in a grower’s field last week tested negative for PCR, which is consistent with studies by USDA-ARS, Wapato suggesting that field bindweed is not a host to Liberibacter. More field bindweed with potato psyllids was found along edges of a potato field in Gooding County, ID. Both eggs and early instar nymphs were found. Although reported to not be a host for liberibacter, this weed is a suitable host for potato psyllids. The importance of field bindweed and other alternate weed hosts of potato psyllids (e.g., nightshades) in facilitating spread of psyllids into potato fields remains to be explored, but good weed management might aid in psyllid management in potato.
We continue to encourage scouting in order to make the most sound and appropriate management steps for a given field.
Refer to the following sites for guidance on scouting and IPM programs for potato psyllids:
http://www.kimberly.uidaho.edu/potatoes/
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf
» http://www.kimberly.uidaho.edu/potatoes/
» http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf
sugarbeets
Sugarbeets Treasure Valley - Idaho
powdery mildew
Posted on: July 6, 2012 by Jerry Neufeld
The Amalgamated Sugar Company Crop Consultants are saying that now is the time to plan your treatments for powdery mildew in sugarbeets. While mildew has not yet been found in the Treasure Valley, Amalgamated Crop Consultants say the modes of action of the mildew chemistries work best if treatments are applied before mildew is found in the field. They are recommending mildew applications start in the west end of the Treasure Valley in the near future for surface irrigated fields. Sprinkler irrigated fields can potentially be delayed by another week or more depending on temperatures. Contact your Amalgamated Crop Consultant for information regarding these treatment recommendations and rotation of chemistries.
onion thrips and green peach aphid
Onion Treasure Valley - Oregon
onion thrips and green peach aphid
Posted on: July 2, 2012 by Jerry Neufeld
Dr. Clint Shock from the OSU Malheur Experiment Station is reporting the following:
onion thrips populations in Ontario area are high where not well controlled.
Green peach aphid populations are still low on potato across Malheur County.
Squash bugs are showing up on squash in Ontario.
Zebra chip pathogen found in Idaho
Potato Magic Valley
potato psyllid & zebra chip
Posted on: July 2, 2012 by Erik Wenninger
Adult psyllids collected from a sticky card on a commercial field in Twin Falls County on June 19 have tentatively tested positive for Liberibacter, the bacterium that causes zebra chip. PCR tests conducted last week by Alex Karasev’s lab are being followed up this week by sequencing the bands to confirm that the sequences belong to Liberibacter. In the mean time, additional psyllids collected last week from this site and from the U-Idaho Kimberly R&E Center will be tested this week for Liberibacter.
We still have not found psyllids of any life stage on potato plants themselves. However, field bindweed was found along the edge of the field near the sticky card with “hot” psyllids, and today we found potato psyllid eggs (but no other life stages) on several field bindweed plants. The importance of this finding in relation to psyllid infestations in potato remains to be explored, but, considering potato psyllids have a broad host range that includes at least 20 plant families, weed management might aid in psyllid management in potato fields. The infested field bindweed also will be tested for Liberibacter.
This is the first (preliminary) finding of Liberibacter-infected psyllids in the Pacific Northwest this season; however, we still strongly recommend that fields be scouted in order to make the most sound and appropriate management steps for a given field.
Refer to the following sites for guidance on scouting and IPM programs for potato psyllids:
http://www.kimberly.uidaho.edu/potatoes/
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf
» http://www.kimberly.uidaho.edu/potatoes/
» http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf
More potato psyllids found in Idaho…
Potato Magic Valley
potato psyllid
Posted on: June 29, 2012 by Erik Wenninger
Updated 29 June 2012
Erik Wenninger, Nora Olsen, Phil Nolte, Mike Thornton, and Alex Karasev, in cooperation with Jeff Miller and Andy Jensen, are monitoring potato fields in Idaho for potato psyllids and Liberibacter, the bacterium that causes zebra chip (ZC). We found four adult potato psyllids on sticky cards that were collected on June 26 from a grower’s field in Twin Falls County. These were collected from the same site from which we collected two adult psyllids the previous week. We also found four adult potato psyllids on sticky cards that were collected on June 27 on bulk potatoes next to our insecticide trials at the Kimberly R&E Center. The samples are being shipped to campus to be tested for presence of Liberibacter. No potato psyllids were found this week at any of the other fields being monitored by our group in Idaho. Numbers of potato psyllids found are still low, and so far no immature potato psyllids have been found in leaf samples at any sites. We suggest that scouting programs in Idaho be intensified, and that IPM programs be ready. Samples can be taken to the Kimberly R&E Center for confirmation of potato psyllid identification. Refer to the following sites for guidance on scouting and IPM programs for potato psyllids:
http://potatoes.com/IPMStuff/PDFs/Idaho%20recommendations%20%202012%20final.pdf
http://www.potatoes.com/pdfs/PotatoPsyllid.pdf
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf
More information on potato psyllids and zebra chip can be found here: http://www.kimberly.uidaho.edu/potatoes/
» http://potatoes.com/IPMStuff/PDFs/Idaho%20recommendations%20%202012%20final.pdf
First potato psyllids found in a commercial field in Idaho…
Potato Magic Valley
potato psyllid
Posted on: June 26, 2012 by Erik Wenninger
Erik Wenninger, Nora Olsen, Phil Nolte, Mike Thornton, and Alex Karasev, in cooperation with Jeff Miller and Andy Jensen, are monitoring potato fields in Idaho for potato psyllids and Liberibacter, the bacterium that causes zebra chip (ZC). We found two adult potato psyllids on sticky cards that were collected on 19 June from a grower’s field in Twin Falls County. This is the first potato psyllid finding we are aware of from a commercial potato field in Idaho during 2012. The samples are being shipped to campus today to be tested for presence of Liberibacter. No potato psyllids were found from last week at any of the other fields being monitored by our group in Idaho. Numbers of potato psyllids found were very low. We suggest that scouting programs in Idaho be intensified, and that IPM programs be ready. Refer to the following sites for guidance on scouting and IPM programs for potato psyllids:
http://potatoes.com/IPMStuff/PDFs/Idaho%20recommendations%20%202012%20final.pdf
http://www.potatoes.com/pdfs/PotatoPsyllid.pdf
More information on potato psyllids and zebra chip can be found here:
http://www.kimberly.uidaho.edu/potatoes/
» http://www.kimberly.uidaho.edu/potatoes/
» http://potatoes.com/IPMStuff/PDFs/Idaho%20recommendations%20%202012%20final.pdf
no potato psyllids in Idaho so far
Potato All Locations
potato psyllid
Posted on: June 22, 2012 by Erik Wenninger
No potato psyllids found on potatoes in Idaho so far...
Updated 22 June 2012
Erik Wenninger, Nora Olsen, Phil Nolte, Mike Thornton, and Alex Karasev, in cooperation from Jeff Miller and Andy Jensen, are monitoring potato fields in Idaho for potato psyllids and Liberibacter, the bacterium that causes zebra chip (ZC). We are still processing some of the samples collected this week, but so far no potato psyllids have been found in any of the fields we are monitoring in Idaho. More information on potato psyllids and zebra chip can be found here: http://www.kimberly.uidaho.edu/potatoes/
Malheur Experiment Station Field Day
Announcements All Locations
Posted on: June 22, 2012 by Jerry Neufeld
Oregon State University will be hosting the “Summer Farm Festival and Malheur Experiment Station Field Day” on July 11, 2012. Click on the pdf below for more information.
Potato Psyllid and Zebra Chip
Announcements All Locations
Potato Psyllid
Posted on: June 15, 2012 by Jerry Neufeld
Click on the pdf below for the latest edition (June 14) of the “Potato Progress”. This edition has an update on Potato Psyllid and Zebra Chip.
potato psyllid updates
All Crops Magic Valley
potato psyllid
Posted on: June 14, 2012 by Erik Wenninger
Updates on potato psyllids and ZC in the PNW
1. A single potato psyllid was found in each of two commercial fields in Oregon (Irrigon, OR on June 11 and Hermiston, OR on June 13). Both tested negative for Liberibacter, the pathogen that causes ZC. Numbers of potato psyllids in fields are very low. We suggest that scouting programs in Idaho be intensified, and that IPM programs be ready.
2. Surveys of emerged potato volunteers by Oregon State University in the Columbia Basin have reported ZC symptomatic plants that have tested positive for Liberibacter. Volunteers could be a source of the bacterium and efforts should be used to reduce volunteer populations in rotational crops. Closely monitor volunteers and submit any symptomatic plants for further analysis.
3. Potato psyllids were recently found on greenhouse-grown plants at garden centers in Boise and Twin Falls, ID. So far these psyllids have tested negative for Liberibacter. Potato psyllids are a difficult pest to manage in the greenhouse and have a broad host range, including common garden center plants like tomatoes and peppers, so these findings are not surprising. Potato psyllids have almost certainly occurred in greenhouses and garden centers in the PNW for many years. The relative importance of field infestations in the PNW originating from infested garden center plants, overwintering populations on weed hosts, and immigration from southern overwintering sites remains to be explored.
4. No potato psyllids have been found on potatoes in Idaho so far...
The take home message from all of these findings is that scouting programs for potato psyllids should be intensified, and IPM programs should be in place. Refer to the following sites for guidance on scouting and IPM programs for potato psyllids:
http://potatoes.com/IPMStuff/PDFs/Idaho%20recommendations%20%202012%20final.pdf
http://www.potatoes.com/pdfs/PotatoPsyllid.pdf
See this site for more psyllid links: http://www.kimberly.uidaho.edu/potatoes/
